第一步：

mWebView.getSettings().setDefaultTextEncodingName("UTF-8");

第二步：

mWebView.loadData(data, "text/html; charset=UTF-8", null);

WebView常用配置：

	private void initWebView() {
		mWebView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);
		mWebView.getSettings().setDefaultTextEncodingName("UTF-8");
		mWebView.getSettings().setJavaScriptEnabled(true);
		mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
		mWebView.getSettings().setSupportZoom(true);
		mWebView.getSettings().setDomStorageEnabled(true);
		mWebView.getSettings().setAllowFileAccess(true);
		mWebView.getSettings().setUseWideViewPort(true);
		mWebView.getSettings().setBuiltInZoomControls(true);
		mWebView.getSettings().setLoadWithOverviewMode(true);
		mWebView.requestFocus();
		mWebView.loadUrl(url);
		mWebView.setWebViewClient(new WebViewClient() {
			@Override
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				return super.shouldOverrideUrlLoading(view, url);
			}

			@Override
			public void onLoadResource(WebView view, String url) {
				super.onLoadResource(view, url);
			}

			@Override
			public void onPageStarted(WebView view, String url,
					android.graphics.Bitmap favicon) {

			};

			@Override
			public void onPageFinished(WebView view, String url) {
				super.onPageFinished(view, url);
			}
		});

	}